From: Jiaxin Yu Date: Mon, 5 Aug 2019 04:56:37 +0000 (+0800) Subject: ASoC: mediatek: mt6358: add delay after dmic clock on X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=ccb1fa21ef58a2ac15519bb878470762e967e8b3;p=linux.git ASoC: mediatek: mt6358: add delay after dmic clock on Most dmics produce a high level when they receive clock. The difference between power-on and memory record time is about 10ms, but the dmic needs 50ms to output normal data. This commit add 100ms delay after SoC output clock so that we can cut off the pop noise at the beginning. Signed-off-by: Jiaxin Yu Link: https://lore.kernel.org/r/1564980997-11359-1-git-send-email-jiaxin.yu@mediatek.com Signed-off-by: Mark Brown --- diff --git a/sound/soc/codecs/mt6358.c b/sound/soc/codecs/mt6358.c index c17250aab2d0b..bb737fd678cc6 100644 --- a/sound/soc/codecs/mt6358.c +++ b/sound/soc/codecs/mt6358.c @@ -1730,6 +1730,10 @@ static int mt6358_dmic_enable(struct mt6358_priv *priv) /* UL turn on */ regmap_write(priv->regmap, MT6358_AFE_UL_SRC_CON0_L, 0x0003); + + /* Prevent pop noise form dmic hw */ + msleep(100); + return 0; }